Problem: A 49-year-old man presents with a five-week history of epigastric pain after meals. It is sometimes awakening him in the night. He has also been vomiting and is sure he has lost weight. On examination, you find epigastric tenderness, with no mass nor peritonism. An FBC is normal. Which is the single most appropriate investigation? Need Assignment Help? a. Serum amylase estimation b. Abdominal ultrasound c. Upper GI endoscopy d. Helicobacter pylori test e. Barium meal